<template>
  <div class="app-container">
    <el-form :model="queryParams" ref="queryForm" size="small" :inline="true" v-show="showSearch" label-width="68px">
      <el-form-item label="图片路径" prop="imgUrl">
        <el-input
          v-model="queryParams.imgUrl"
          placeholder="请输入图片路径"
          clearable
          @keyup.enter.native="handleQuery"
        />
      </el-form-item>
      <el-form-item label="状态" prop="status">
        <el-select v-model="queryParams.status" placeholder="请选择状态" clearable>
          <el-option label="未启用" value="0" />
          <el-option label="已启用" value="1" />
        </el-select>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" icon="el-icon-search" size="mini" @click="handleQuery">搜索</el-button>
        <el-button icon="el-icon-refresh" size="mini" @click="resetQuery">重置</el-button>
      </el-form-item>
    </el-form>

    <el-row :gutter="10" class="mb8">
      <el-col :span="1.5">
        <el-button
          type="primary"
          plain
          icon="el-icon-plus"
          size="mini"
          @click="handleAdd"
          v-hasPermi="['system:background:add']"
        >新增</el-button>
      </el-col>
      <el-col :span="1.5">
        <el-button
          type="success"
          plain
          icon="el-icon-edit"
          size="mini"
          :disabled="single"
          @click="handleUpdate"
          v-hasPermi="['system:background:edit']"
        >修改</el-button>
      </el-col>
      <el-col :span="1.5">
        <el-button
          type="danger"
          plain
          icon="el-icon-delete"
          size="mini"
          :disabled="multiple"
          @click="handleDelete"
          v-hasPermi="['system:background:remove']"
        >删除</el-button>
      </el-col>
      <el-col :span="1.5">
        <el-button
          type="warning"
          plain
          icon="el-icon-download"
          size="mini"
          @click="handleExport"
          v-hasPermi="['system:background:export']"
        >导出</el-button>
      </el-col>
      <right-toolbar :showSearch.sync="showSearch" @queryTable="getList"></right-toolbar>
    </el-row>

    <el-table v-loading="loading" :data="backgroundList" @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55" align="center" />
      <el-table-column label="背景ID，主键，自增" align="center" prop="id" />
      <el-table-column label="图片路径" align="center" prop="imgUrl" width="300">
        <template slot-scope="scope">
          <el-image 
            v-if="scope.row.imgUrl"
            style="width: 100px; height: 60px; border-radius: 4px;"
            :src="scope.row.imgUrl" 
            :preview-src-list="[scope.row.imgUrl]"
            fit="cover">
          </el-image>
          <span v-else>{{ scope.row.imgUrl }}</span>
        </template>
      </el-table-column>
      <el-table-column label="状态" align="center" prop="status" width="120">
        <template slot-scope="scope">
          <el-tag v-if="scope.row.status == 1" type="success" effect="dark">
            <i class="el-icon-check"></i> 已启用
          </el-tag>
          <el-tag v-else type="info" effect="plain">
            <i class="el-icon-close"></i> 未启用
          </el-tag>
        </template>
      </el-table-column>
      <el-table-column label="操作" align="center" class-name="small-padding fixed-width" width="200">
        <template slot-scope="scope">
          <el-button
            v-if="scope.row.status != 1"
            size="mini"
            type="text"
            icon="el-icon-open"
            @click="handleEnable(scope.row)"
            v-hasPermi="['system:background:edit']"
            style="color: #67C23A;"
          >启用</el-button>
          <el-button
            v-else
            size="mini"
            type="text"
            icon="el-icon-turn-off"
            @click="handleDisable(scope.row)"
            v-hasPermi="['system:background:edit']"
            style="color: #909399;"
          >禁用</el-button>
          <el-button
            size="mini"
            type="text"
            icon="el-icon-edit"
            @click="handleUpdate(scope.row)"
            v-hasPermi="['system:background:edit']"
          >修改</el-button>
          <el-button
            size="mini"
            type="text"
            icon="el-icon-delete"
            @click="handleDelete(scope.row)"
            v-hasPermi="['system:background:remove']"
          >删除</el-button>
        </template>
      </el-table-column>
    </el-table>
    
    <pagination
      v-show="total>0"
      :total="total"
      :page.sync="queryParams.pageNum"
      :limit.sync="queryParams.pageSize"
      @pagination="getList"
    />

    <!-- 添加或修改背景图片对话框 -->
    <el-dialog :title="title" :visible.sync="open" width="500px" append-to-body>
      <el-form ref="form" :model="form" :rules="rules" label-width="80px">
        <el-form-item label="图片路径" prop="imgUrl">
          <el-input v-model="form.imgUrl" placeholder="请输入图片URL地址" />
        </el-form-item>
        <el-form-item label="状态" prop="status">
          <el-radio-group v-model="form.status">
            <el-radio :label="0">未启用</el-radio>
            <el-radio :label="1">启用（启用后其他背景将自动禁用）</el-radio>
          </el-radio-group>
        </el-form-item>
        <el-form-item label="预览" v-if="form.imgUrl">
          <el-image 
            style="width: 400px; height: 240px; border-radius: 4px;"
            :src="form.imgUrl" 
            fit="contain">
            <div slot="error" class="image-slot">
              <i class="el-icon-picture-outline"></i>
              <span>加载失败</span>
            </div>
          </el-image>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button type="primary" @click="submitForm">确 定</el-button>
        <el-button @click="cancel">取 消</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import { listBackground, getBackground, delBackground, addBackground, updateBackground } from "@/api/system/background"

export default {
  name: "Background",
  data() {
    return {
      // 遮罩层
      loading: true,
      // 选中数组
      ids: [],
      // 非单个禁用
      single: true,
      // 非多个禁用
      multiple: true,
      // 显示搜索条件
      showSearch: true,
      // 总条数
      total: 0,
      // 背景图片表格数据
      backgroundList: [],
      // 弹出层标题
      title: "",
      // 是否显示弹出层
      open: false,
      // 查询参数
      queryParams: {
        pageNum: 1,
        pageSize: 10,
        imgUrl: null,
        status: null,
      },
      // 表单参数
      form: {},
      // 表单校验
      rules: {
        imgUrl: [
          { required: true, message: "图片路径不能为空", trigger: "blur" }
        ],
      }
    }
  },
  created() {
    this.getList()
  },
  methods: {
    /** 查询背景图片列表 */
    getList() {
      this.loading = true
      listBackground(this.queryParams).then(response => {
        this.backgroundList = response.rows
        this.total = response.total
        this.loading = false
      })
    },
    // 取消按钮
    cancel() {
      this.open = false
      this.reset()
    },
    // 表单重置
    reset() {
      this.form = {
        id: null,
        imgUrl: null,
        status: null,
        createTime: null
      }
      this.resetForm("form")
    },
    /** 搜索按钮操作 */
    handleQuery() {
      this.queryParams.pageNum = 1
      this.getList()
    },
    /** 重置按钮操作 */
    resetQuery() {
      this.resetForm("queryForm")
      this.handleQuery()
    },
    // 多选框选中数据
    handleSelectionChange(selection) {
      this.ids = selection.map(item => item.id)
      this.single = selection.length!==1
      this.multiple = !selection.length
    },
    /** 新增按钮操作 */
    handleAdd() {
      this.reset()
      this.open = true
      this.title = "添加背景图片"
    },
    /** 修改按钮操作 */
    handleUpdate(row) {
      this.reset()
      const id = row.id || this.ids
      getBackground(id).then(response => {
        this.form = response.data
        this.open = true
        this.title = "修改背景图片"
      })
    },
    /** 提交按钮 */
    submitForm() {
      this.$refs["form"].validate(valid => {
        if (valid) {
          // 如果要启用该背景，先禁用其他所有背景
          if (this.form.status == 1) {
            this.$modal.confirm('启用该背景后，其他背景将自动禁用，是否继续？').then(() => {
              this.saveBackground()
            }).catch(() => {})
          } else {
            this.saveBackground()
          }
        }
      })
    },
    /** 保存背景图片 */
    saveBackground() {
      if (this.form.id != null) {
        updateBackground(this.form).then(response => {
          this.$modal.msgSuccess("修改成功")
          this.open = false
          this.getList()
        })
      } else {
        addBackground(this.form).then(response => {
          this.$modal.msgSuccess("新增成功")
          this.open = false
          this.getList()
        })
      }
    },
    /** 启用背景 */
    handleEnable(row) {
      this.$modal.confirm('是否启用该背景图片？启用后其他背景将自动禁用。').then(() => {
        return getBackground(row.id).then(response => {
          const backgroundData = response.data
          backgroundData.status = 1
          return updateBackground(backgroundData)
        })
      }).then(() => {
        this.getList()
        this.$modal.msgSuccess("启用成功")
      }).catch(() => {})
    },
    /** 禁用背景 */
    handleDisable(row) {
      this.$modal.confirm('是否禁用该背景图片？').then(() => {
        return getBackground(row.id).then(response => {
          const backgroundData = response.data
          backgroundData.status = 0
          return updateBackground(backgroundData)
        })
      }).then(() => {
        this.getList()
        this.$modal.msgSuccess("禁用成功")
      }).catch(() => {})
    },
    /** 删除按钮操作 */
    handleDelete(row) {
      const ids = row.id || this.ids
      this.$modal.confirm('是否确认删除背景图片编号为"' + ids + '"的数据项？').then(function() {
        return delBackground(ids)
      }).then(() => {
        this.getList()
        this.$modal.msgSuccess("删除成功")
      }).catch(() => {})
    },
    /** 导出按钮操作 */
    handleExport() {
      this.download('system/background/export', {
        ...this.queryParams
      }, `background_${new Date().getTime()}.xlsx`)
    }
  }
}
</script>
